Get a volt meter
and check the voltage across the battery while the engine
is running at 3K RPM's. You should get a reading of 14.3 to
15.3 volts. Any less or more and the regulator is bad.

Checking
the Stator

After checking
the Voltage Regulator, check the Stator or alternator or generator,
whatever you like to call it, to make sure it's the VR going
bad. On the VR there's a plug with 3 white wires in it. Pull
that and get your multi-meter out. Set it to Rx10 and check
the resistance of the top white wire with the second white
wire, then the top wire with the third white wire. You should
get a reading of 0.31 to 0.37 ohms. Any less or no resistance
and the stator coil is bad. Normally though, it's the VR that's
bad.

On the left side
of the bike is the stator..the 3 wire plug coming out of the
sidecover disconnect it and put the voltmeter on AC volts...start
bike..put a lead from the meter on one of the white wires
(all 3 are white) and the other test lead on another white
white wire..Have someone rev the bike to a steady 3000RPM..do
you get at least 40 ac volts?? if you do repeat with the other
white wire...same results?? If you get 30-40 acvolts on both
legs but the battery is not charging at the specified 14.3-15.3
then the rectifier/regulator is bad.

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